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International Journal of Nanoparticles最新文献

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Computational analysis of the machining of laser-hardened D2 tool steel 激光硬化D2工具钢加工的计算分析
International Journal of Nanoparticles Pub Date : 2008-10-24 DOI: 10.1504/IJNP.2008.020899
M. Jackson, M. Whitfield
{"title":"Computational analysis of the machining of laser-hardened D2 tool steel","authors":"M. Jackson, M. Whitfield","doi":"10.1504/IJNP.2008.020899","DOIUrl":"https://doi.org/10.1504/IJNP.2008.020899","url":null,"abstract":"The contact between D2 tool steel and a single-point cutting tool creates significant opportunities to understand how dry machining of laser-hardened materials affects the economics of manufacturing, especially at the microscale. The present paper not only compares various computational approaches to the solution of shear plane and tool face temperatures during dry machining, but also discusses how the heat is generated and the accompanying forces react to large changes in the coefficient of friction. The paper accounts for the changes in material properties during machining and also shows how stresses and strains are affected by subtle and vulgar changes in the magnitude of the coefficient of friction.","PeriodicalId":14016,"journal":{"name":"International Journal of Nanoparticles","volume":"1 1","pages":"241-269"},"PeriodicalIF":0.0,"publicationDate":"2008-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1504/IJNP.2008.020899","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66770001","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
The use of portable particle measurement devices to characterise airborne particles generated in various settings 使用便携式颗粒测量装置来表征在各种环境中产生的空气中颗粒
International Journal of Nanoparticles Pub Date : 2008-10-24 DOI: 10.1504/IJNP.2008.020894
R. Handy, Monica Rodriguez, M. Whitt, S. Boregowda, J. Dues, M. Jackson
{"title":"The use of portable particle measurement devices to characterise airborne particles generated in various settings","authors":"R. Handy, Monica Rodriguez, M. Whitt, S. Boregowda, J. Dues, M. Jackson","doi":"10.1504/IJNP.2008.020894","DOIUrl":"https://doi.org/10.1504/IJNP.2008.020894","url":null,"abstract":"The accurate measurement of ultrafine and submicron sized airborne particles is a challenging task. Since several studies have linked exposures to airborne ultrafine particles to elevated human health risks, the need to assess the concentrations of particles in the workplace that are below one micron in diameter is imperative. Several techniques for directly monitoring micro and nanoparticles are available and others are being tested for their merit. Condensation Nuclei Counters (CNCs), portable condensation particle counters, differential mobility analysers, electron microscopy and other novel approaches to measuring micro and nanoparticles have been employed in investigations. The purpose of this paper is to elucidate the results from three studies involving the measurement of airborne particles with a laser particle counter and condensation nuclei counter. The three environments include: a gambling casino, a Shielded Metal Arc Welding (SMAW) operation and a general manufacturing facility with welding, cutting and grinding operations being performed.","PeriodicalId":14016,"journal":{"name":"International Journal of Nanoparticles","volume":"1 1","pages":"177-184"},"PeriodicalIF":0.0,"publicationDate":"2008-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1504/IJNP.2008.020894","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66769832","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Synthesis of tungsten oxide nanostructures by laser pyrolysis 激光热解法制备氧化钨纳米结构
International Journal of Nanoparticles Pub Date : 2008-10-24 DOI: 10.1504/IJNP.2008.020895
B. Mwakikunga, A. Forbes, E. Sideras-haddad, R. Erasmus, G. Katumba, B. Masina
{"title":"Synthesis of tungsten oxide nanostructures by laser pyrolysis","authors":"B. Mwakikunga, A. Forbes, E. Sideras-haddad, R. Erasmus, G. Katumba, B. Masina","doi":"10.1504/IJNP.2008.020895","DOIUrl":"https://doi.org/10.1504/IJNP.2008.020895","url":null,"abstract":"Since the proposal to synthesise materials by laser assisted pyrolysis in the 1970s, and its practical realisation in 1982, a number of researchers have used this method in obtaining nano-powders from liquid droplets. This study revisits this technique by introducing a new aspect in that it considers obtaining thin films rather than powders. A full experimental arrangement, including laser optimisation, optical layout and materials processing procedures is described. Synthesis of WO3 nanostructures by this method is reported for the first time, with the mean diameter and length determined to be 51 nm and 6.8 µm, respectively. A possible mechanism for production of such nanostructures is proposed owing to the selective dissociation of the O-C bonds in the tungsten ethoxide precursor liquid which resonate with the 10.6 µm emission wavelength of the CO2 laser employed.","PeriodicalId":14016,"journal":{"name":"International Journal of Nanoparticles","volume":"1 1","pages":"185-202"},"PeriodicalIF":0.0,"publicationDate":"2008-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1504/IJNP.2008.020895","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66769838","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 14
Pulsed laser liquid-solid interaction synthesis of Pt, Au, Ag and Cu nanosuspensions and their stability 脉冲激光液固相互作用合成Pt、Au、Ag和Cu纳米悬浮液及其稳定性
International Journal of Nanoparticles Pub Date : 2008-10-24 DOI: 10.1504/IJNP.2008.020897
M. Maaza, Herculano Chambalo, S. Ekambaram, O. Nemraoui, B. Ngom, N. Manyala
{"title":"Pulsed laser liquid-solid interaction synthesis of Pt, Au, Ag and Cu nanosuspensions and their stability","authors":"M. Maaza, Herculano Chambalo, S. Ekambaram, O. Nemraoui, B. Ngom, N. Manyala","doi":"10.1504/IJNP.2008.020897","DOIUrl":"https://doi.org/10.1504/IJNP.2008.020897","url":null,"abstract":"This paper reports on the stability of Pt, Ag, Au and Cu nanosuspensions synthesised by Laser Liquid-Solid Interaction (LLSI) with the fundamental Nd:YAG frequency. The stability of the metallic nanoparticles in three different dispersing liquid agents, namely, water, acetonitrile and pentane, has been investigated in terms of the solvents' polarisability index, local electric molecular dipole and viscosity. These parameters were varied within the following value range: 0.0-10.2 PI, 0.0-3.44 Debyes and 0.23-1.0 cP, respectively. The stability of the metallic nanoparticles within the dispersing agents was mainly investigated via their respective surface plasmon peaks which occur in UV-VIS spectral range.","PeriodicalId":14016,"journal":{"name":"International Journal of Nanoparticles","volume":"1 1","pages":"212-223"},"PeriodicalIF":0.0,"publicationDate":"2008-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1504/IJNP.2008.020897","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66769941","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
Femtosecond laser dressing of the surfaces of porous alumina grinding wheels 多孔氧化铝砂轮表面的飞秒激光修整
International Journal of Nanoparticles Pub Date : 2008-10-24 DOI: 10.1504/IJNP.2008.020896
M. Jackson, G. Robinson
{"title":"Femtosecond laser dressing of the surfaces of porous alumina grinding wheels","authors":"M. Jackson, G. Robinson","doi":"10.1504/IJNP.2008.020896","DOIUrl":"https://doi.org/10.1504/IJNP.2008.020896","url":null,"abstract":"The interaction of 180 fs, 775 nm laser pulses with the surfaces of alumina and glass under controlled gas atmospheres at ambient pressure has been investigated to study material redeposition, residual surface roughness and ablation rate. The effect of using various gases to protect the surface of the material appears to interfere with the effects of the plasma and can change the resulting microstructure of the dressed surface. By varying the combinations of fluence and laser scanning speed during ultra fast ablation at high repetition rates an optimum dressing condition can be reached. The process can be used to continuously dress porous vitrified cutting tools that are used for micro and nanogrinding processes.","PeriodicalId":14016,"journal":{"name":"International Journal of Nanoparticles","volume":"1 1","pages":"203-211"},"PeriodicalIF":0.0,"publicationDate":"2008-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1504/IJNP.2008.020896","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66769880","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Finite element thermal analysis of micro-EDM 微细电火花加工有限元热分析
International Journal of Nanoparticles Pub Date : 2008-10-24 DOI: 10.1504/IJNP.2008.020898
Rajeev Kumar, V. Yadava
{"title":"Finite element thermal analysis of micro-EDM","authors":"Rajeev Kumar, V. Yadava","doi":"10.1504/IJNP.2008.020898","DOIUrl":"https://doi.org/10.1504/IJNP.2008.020898","url":null,"abstract":"A finite element-based thermal model for the Micro Electro-Discharge Machining (µ-EDM) is developed for the determination of temperature distribution in the zone of influence of single spark. The model is able to predict the shape and size of the crater that is formed by single spark as a result of the material removal. The calculated crater radius result is verified by comparing them with experimental results available in literature. Energy partition is also determined using computational experiments. Parametric study for crater radius, crater depth, Material Removal Rate (MRR) and energy partition has been also done. It has been found that heat flux and input energy significantly affect energy partition value.","PeriodicalId":14016,"journal":{"name":"International Journal of Nanoparticles","volume":"1 1","pages":"224-240"},"PeriodicalIF":0.0,"publicationDate":"2008-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1504/IJNP.2008.020898","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66769953","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
Synthesis and characterisation of carbon nanotube reinforced copper matrix nanocomposites 碳纳米管增强铜基纳米复合材料的合成与表征
International Journal of Nanoparticles Pub Date : 2008-09-12 DOI: 10.1504/IJNP.2008.020270
F. A. Khalid, M. Bashir, S. Arshad
{"title":"Synthesis and characterisation of carbon nanotube reinforced copper matrix nanocomposites","authors":"F. A. Khalid, M. Bashir, S. Arshad","doi":"10.1504/IJNP.2008.020270","DOIUrl":"https://doi.org/10.1504/IJNP.2008.020270","url":null,"abstract":"This work presents the multi-walled carbon nanotubes (CNTs) reinforced copper matrix nanocomposites that were synthesised by a chemical based route commonly known as molecular level mixing. These nanocomposites can exhibit much superior properties as compared to other metal matrix composites. A copper acetate monohydrate sample was mixed with CNTs in ethanol followed by drying, calcination, and reduction. This resulted in the formation of copper nanoparticles attached with uniformly dispersed CNTs. The samples at each process step were characterised by using Fourier transform infrared spectroscopy (FTIR), x-ray diffraction (XRD), and scanning electron microscopy (SEM). Emphasis is placed on the functionalisation of the CNTs and its role in deagglomeration in order to achieve uniform mixing with the copper metal matrix. Sintering of the powder was done at 900°C for two hours and SEM studies revealed good retention and uniform distribution of CNTs in the copper-based matrix of the nanocomposite samples indicating considerable benefits of the synthesis process.","PeriodicalId":14016,"journal":{"name":"International Journal of Nanoparticles","volume":"1 1","pages":"164-173"},"PeriodicalIF":0.0,"publicationDate":"2008-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1504/IJNP.2008.020270","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66769782","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Laser engineered net shaping for the acquisition of porous and dense structures using nanoparticles 利用纳米颗粒获得多孔致密结构的激光工程网成形
International Journal of Nanoparticles Pub Date : 2008-01-01 DOI: 10.1504/IJNP.2008.026475
T. Novakov, M. Jackson
{"title":"Laser engineered net shaping for the acquisition of porous and dense structures using nanoparticles","authors":"T. Novakov, M. Jackson","doi":"10.1504/IJNP.2008.026475","DOIUrl":"https://doi.org/10.1504/IJNP.2008.026475","url":null,"abstract":"This paper presents a research study on the influence of process parameters to obtain porous and/or dense structures using Laser Engineered Net Shaping (LENS). Laser power, scan speed, hatch/raster spacing and powder feed rate are considered to be the most influential parameters on the structure and mechanical characteristics of materials processed using LENS. Therefore, these parameters have been varied to obtain vital information about the possibilities that the LENS system offers. Influence of process parameters on the structure of the porous structure, density, as well as columnar grain growth has been analysed. It has been verified that laser power and powder feed rate have the largest influence on the hardness of porous samples, while raster spacing in combination with powder feed rate dictate the level of pore connectivity.","PeriodicalId":14016,"journal":{"name":"International Journal of Nanoparticles","volume":"1 1","pages":"327-333"},"PeriodicalIF":0.0,"publicationDate":"2008-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1504/IJNP.2008.026475","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66769712","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Design of slotted grinding wheels 开槽砂轮的设计
International Journal of Nanoparticles Pub Date : 2008-01-01 DOI: 10.1504/IJNP.2008.026476
M. Jackson
{"title":"Design of slotted grinding wheels","authors":"M. Jackson","doi":"10.1504/IJNP.2008.026476","DOIUrl":"https://doi.org/10.1504/IJNP.2008.026476","url":null,"abstract":"Advanced grinding processes require slotted grinding wheels that can rotate at exceptionally high speeds without distorting or failing catastrophically. These wheels are usually reinforced and the grinding medium is usually attached to the periphery of the wheel using a strong bonding agent such as an epoxy adhesive. The paper uses procedures that were developed for designing grinding wheels for creep feed grinding processes and the more modern process of high efficiency deep grinding (HEDG). The grinding wheel is normally attached to the machine tool spindle so that it does not become loose, which would otherwise cause harm to the operator and to the machine tool structure itself. Procedures for safe practice and good mechanical design safety at very high rotational speeds are discussed when applied to high speed grinding processes such as HEDG grinding and VIPER grinding.","PeriodicalId":14016,"journal":{"name":"International Journal of Nanoparticles","volume":"1 1","pages":"334-352"},"PeriodicalIF":0.0,"publicationDate":"2008-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1504/IJNP.2008.026476","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66769735","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 8
Nanoparticulate reinforced metal matrix nanocomposites – a review 纳米颗粒增强金属基纳米复合材料研究进展
International Journal of Nanoparticles Pub Date : 2008-01-01 DOI: 10.1504/IJNP.2008.026473
F. He, Qingyou Han, M. Jackson
{"title":"Nanoparticulate reinforced metal matrix nanocomposites – a review","authors":"F. He, Qingyou Han, M. Jackson","doi":"10.1504/IJNP.2008.026473","DOIUrl":"https://doi.org/10.1504/IJNP.2008.026473","url":null,"abstract":"Particulate reinforced metal matrix composites (MMCs) are widely used in many industries. With the development of nanotechnologies, the particulates scales down to the nano-level to enhance MMCs. MMCs with nano-sized reinforcements are termed as metal matrix nanocomposite (MMNCs). MMNCs have shown promising properties. Many researchers are using different methods to fabricate MMNCs. In this paper, some commonly used methods used to fabricate MMNCs are introduced including: powder metallurgy, casting, rapid solidification and in-situ fabrication. The enhancing mechanism of MMNCs is discussed. The properties obtained by different methods are illustrated. Some unsolved problems are also listed.","PeriodicalId":14016,"journal":{"name":"International Journal of Nanoparticles","volume":"1 1","pages":"301-309"},"PeriodicalIF":0.0,"publicationDate":"2008-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1504/IJNP.2008.026473","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66770159","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 60
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